WhiteboardsYou will want (ideally) two whiteboards. This particular model is pricey but high quality—it doesn't shake too much when you write on it, which is a big deal. If you can't get whiteboards, consider:

Black Whiteboard MarkersYou'll use these on the whiteboards and for exercises on paper. Using a thicker marker will keep your ideas pithy and easy for others to read. Chisel tip is best. Get 12 markers.

Masking tapeFor posting solution sketches on the wall. Get at least one roll.

1/4" dot stickersYou'll use these for heat maps. Get a few hundred stickers (one box of ChromaLabel dots has 1,000 stickers).

3/4" dot stickersYou'll use these for voting. Get a few dozen stickers (one box of ChromaLabel dots has 1,000 stickers).

Healthy snacksEat healthy snacks during your sprint. Apples, bananas, yogurt, nuts, and dark chocolate. Get more than enough for everybody. Sugary foods and big burritos will make everyone sluggish by afternoon, so opt for healthy.

KIND barsThese are nice to have on hand. They make good treats in a sprint—they're healthy enough, easy to eat, and easy to find.